← Back to SOC feed Coverage →

Elex Installer NSIS

yara LOW Yara-Rules
community
This rule was pulled from an open-source repository and enriched with AI. Validate in a test environment before deploying to production.
View original rule at Yara-Rules →
Retrieved: 2026-06-13T23:00:00Z · Confidence: medium

Hunt Hypothesis

The Elex Installer NSIS rule detects the execution of a potentially malicious NSIS installer associated with the Elex tool, which may be used for lateral movement or persistence. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify and mitigate early-stage adversary activity that could lead to deeper network compromise.

YARA Rule

rule Trj_Elex_Installer_NSIS 
{
   
    meta:
        author = "Centro Criptológico Nacional (CCN)"
        description = "Elex Installer NSIS"
        ref = "https://www.ccn-cert.cni.es/informes/informes-ccn-cert-publicos.html"
        
    strings:
        $mz = { 4d 5a }
        $str1 = {4e 75 6c 6c 73 6f 66 74 }
        $str2 = {b7 a2 d5 dc 0c d6 a6 3a}
        
    condition:
        ($mz at 0) and ($str1 at 0xA008) and ($str2 at 0x1c8700)
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

This rule contains 3 string patterns in its detection logic.

False Positive Guidance

Original source: https://github.com/Yara-Rules/rules/blob/main/malware/MALW_Elex.yar